Influence of annealing temperature on physical properties and photocatalytic ability of g-C 3 N 4 nanosheets synthesized through urea polymerization in Ar atmosphere
| Autor: | Nguyen Van Minh, Dao Viet Thang, Ngoc Diep Lai, Nguyen Manh Hung, Lam Thi Hang, Do Danh Bich, Le Thi Mai Oanh, Nguyen Thi Phuong |
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| Přispěvatelé: | Laboratoire de Photonique Quantique et Moléculaire (LPQM), École normale supérieure - Cachan (ENS Cachan)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université Laval [Québec] (ULaval) |
| Rok vydání: | 2018 |
| Předmět: |
[PHYS]Physics [physics]
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] Materials science Heptazine Absorption spectroscopy Scanning electron microscope Annealing (metallurgy) Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] X-ray photoelectron spectroscopy chemistry Specific surface area Photocatalysis Electrical and Electronic Engineering Fourier transform infrared spectroscopy 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physica B: Condensed Matter Physica B: Condensed Matter, Elsevier, 2018, 532, pp.48-53. ⟨10.1016/j.physb.2017.05.026⟩ |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2017.05.026 |
| Popis: | The influences of annealing temperature on structure, morphology, vibration, optical properties and photocatalytic ability of g-C 3 N 4 nanosheets synthesized from urea in Ar atmosphere were investigated in detail by using x-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), Fourier transform infrared spectroscopy (FTIR), UV–vis absorption, and photoluminescence (PL). It was found that the preparation temperature had a great effect on structure and physical properties of g-C 3 N 4 . As the processing temperature increased from 450 °C to 650 °C, the interlayer stacking distance of g-C 3 N 4 decreased from 3.281 A to 3.217 A and the lattice parameter a decreased from 5.010 A to 4.934 A. This indicated a denser packing fashion of g-C 3 N 4 at high annealing temperature. Moreover, the FTIR spectra and SEM images revealed a large fraction of small polymer segments containing only a few heptazine units as annealing temperature increased. BET result indicated an increasing specific surface area as preparation temperature increased. UV–vis absorption spectra showed a decrease of the band gap energy with increasing calcination temperature which agrees well with the measured PL spectra. It was demonstrated that samples annealed at 550 °C exhibited the strongest photocatalytic activity. A decomposition of 80% and 100% of rhodamine B was obtained within respectively 1 h and 2 h under Xenon lamp irradiation. Photocatalytic result could be adequately explained based on evidences of specific surface area, average pore volume and pore size, and recombination rate of photoinduced electron-hole pairs. |
| Databáze: | OpenAIRE |
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